the fbi began by investigating whether those e-mails constituted harassment. officials told nbc news. then the bureau subsequently found that petraeus' biographer, paula broadwell, was sending those anonymous e-mails that law enforcement officials had dealt with. the investigation also determined she was having an affair with petraeus. the fbi then used that information from the investigation to uncover more details and obtain a warrant to surveil broadwell's e-mail, according to the "wall street journal." so, in september, officials say the fbi interviewed broadwell, who then admitted the affair. investigators also convinced her to voluntarily surrender her computer, which was found to contain unauthorized classified information. according to officials, on the week of october 28th, the fbi then interviewed general petraeus, who reportedly admitted the affair at the time, but denied providing any classified information to broadwell. then two members of congress say they received a tip about the same investigation in october which was raised with the fbi. offic